Reference 3A Decapo "i" sounds shrilly

I just bought a Reference 3a Decapo "i" version pair of speakers mounted on sound anchors speaker stands. I'm using a Antique sound lab ki22 fox dt integrated, Cary 306 cdp, siltech interconnects and Harmonic Tech pro speaker cables. The sound is shrill to the point of listener fatique and dissapointment. Is it my cables, the amp/speaker combo, the speakers? I'm confused and frustrated. Any suggestion?